Trowel blade



FIG. 1 is a top view showing a new design;

FIG. 2 is a bottom view of the new design;

FIG. 3 is a front view of the new design;

FIG. 4 is a left side view of the new design;

FIG. 5 is a right side view of the new design; and,

FIG. 6 is a perspective view of the new design.

The ornamental design for a trowel blade, as shown and described.